@article{MZ_1939__45_168867,
     author = {G., Lyra},
     title = {\"Uber einen {Satz} zur {Theorie} der {C-summierbaren} {Reihen}},
     journal = {Mathematische Zeitschrift},
     pages = {559--572},
     publisher = {mathdoc},
     volume = {45},
     year = {1939},
     zbl = {0023.02603},
     url = {http://geodesic.mathdoc.fr/item/MZ_1939__45_168867/}
}